Abstract: An active energy saving method for household air conditioners based on the L-M algorithm is proposed. By obtaining operating data of the air conditioner, the time required for the indoor temperature to reach the set temperature is predicted in real-time, combined with the cooling rate, the operating frequency of the compressor is controlled, and the operating curve is continuously optimized to achieve the goal of more energy saving and more comfortable use. The most energy-efficient operating path with reducing work on latent heat, and reducing damping, which is combined with PID control, the indoor temperature control is more stable and smoother to reach the set temperature to reduce the increase in useless energy consumption caused by temperature fluctuations. The test results show that the algorithm has an energy saving rate of nearly 25% in certain environments, and the energy saving effect is good.

Key words: L-M algorithm, Active energy saving, Frequency